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Set value in a excel worksheet to equal the length of the previous column in C#

Posted on 2016-10-03
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Last Modified: 2016-11-01
I have a excel workbook with multiple worksheets.I would like to set one column H to be a formula field which is equal to the length of column G. How can I do it using C#.

Thanks,
Aditya
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Question by:giveindia
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LVL 55

Expert Comment

by:Rgonzo1971
ID: 41826149
Hi,

pls try something like this
string s = "=LEN(RC[-1])";
Range rng1 = sheet.get_Range(sheet.Cells[7, 2], (sheet.Cells[7, 2] as Excel.Range).get_End(Excel.XlDirection.xlDown)).Offset[0,1];
rng1.FormulaR1C1 = s;
rng1.Value2 = rng1.Value2;

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Regards
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Author Comment

by:giveindia
ID: 41826219
What is value1 and value2 here ?
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LVL 55

Expert Comment

by:Rgonzo1971
ID: 41826222
.Value2 gives you the underlying value of the cell (could be empty, string, error, number (double) or boolean)

.Value gives you the same as .Value2 except if the cell was formatted as currency or date it gives you a VBA currency (which may truncate decimal places) or VBA date.

Using .Value is usually a bad idea because you may not get the real value from the cell, and they are slower than .Value2
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Author Comment

by:giveindia
ID: 41826238
So the first time the excel is saved the value gets saved correctly. If I open the excel and edit a cell the length column does not get updated.

Thanks,
Aditya
0
 
LVL 55

Expert Comment

by:Rgonzo1971
ID: 41826247
pls try
        string s = "=LEN(RC[-1])";
        Rng1= (Excel.Range)xlWorkSheet.get_Range(xlWorkSheet.Cells[2, 7] as Excel.Range, (xlWorkSheet.Cells[2, 7] as Excel.Range).get_End(Excel.XlDirection.xlDown)).Offset[0,1];
        Rng1.FormulaR1C1 = s;
        Rng1.Value2 = Rng1.Value2;

Open in new window

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Author Comment

by:giveindia
ID: 41826250
THis is the code that I have.
 string s = "=LEN(RC[-1])";
                               Microsoft.Office.Interop.Excel.Range rng1 = wsheet.get_Range(wsheet.Cells[2, 7], (wsheet.Cells[dsMDOID.Tables[0].Rows.Count + 1, 7] as Excel.Range).get_End(Excel.XlDirection.xlDown)).Offset[0, 1];
                               rng1.FormulaR1C1 = s;
                               rng1.Value2 = rng1.Value2;
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Author Comment

by:giveindia
ID: 41826257
Also even if  I have 20 rows in the sheet it seems to apply the formula to around 65K rows.
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LVL 55

Accepted Solution

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Rgonzo1971 earned 2000 total points
ID: 41826355
then try
  string s = "=LEN(RC[-1])";
Microsoft.Office.Interop.Excel.Range rng1 = wsheet.get_Range(wsheet.Cells[2, 7], (wsheet.Cells[dsMDOID.Tables[0].Rows.Count + 1, 7] as Excel.Range)).Offset[0, 1];
rng1.FormulaR1C1 = s;
rng1.Value2 = rng1.Value2; 

Open in new window

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Author Comment

by:giveindia
ID: 41827435
The code you posted seems to be similar to what I had.

Thanks,
Adittya
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LVL 55

Expert Comment

by:Rgonzo1971
ID: 41827470
get_end removed
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